Chapter 5 Results
Before we start doing the analysis, we want to show the current situation of spread of COVID-19 in the whole world since that will explain why COVID-19 is a world-wide serious problem. But instead of showing the information of all the countries, we selected six countries in different continent, which are China, India, Sweden, Russia, United Kingdom and United States.
The graph below shows the progress of total cases per million for selected countries: China, India, Sweden, Russia, United Kingdom, United States. The flattening curve means slowing down the rate of infections. This cumulative curve can help us see the cumulative change of infection cases every day. This graph shows that since the first confirmed case, the rate of epidemic growth has gradually increased. Although in about 400 days, the growth rate of these countries has shown a downward trend, but after a short period of time, the growth rate of the United States, Sweden and United Kingdom has increased again. This shows that the spread of the COVID-19 is difficult to suppress.

We also plot the changes in the number of new cases in this six countries after the first case was confirmed. This graph shows the changes in the number of new infections per day. We can see the number of new infection cases in each country in each time period and the comparison of the number of new infection cases in each country in the same time period. We can see a sudden increase in the number of new infections in India in about 400 days after the first confirmed cases. And for the United States, the number of new cases confirmed shows an increasing trend after the first confirmed case. Although there was a turning point at about 350 days after the first case, it increased again after about 100 days of the turning point. It also proved that COVID-19 is a very serious virus and difficult to control.

Since we are mainly focusing on the data in the United States, we want to show the current situation of spread of COVID-19 in the United States separately. All the graphs below are using the data collected on 2021-12-09.
The map below shows the distribution of confirmed cases in the United States. It indicates the cumulative confirmed cases in United States on 12/9/2021. Each red point represents the number of confirmed cases in a city, and the size of the point reflects the relative amount of the exact number. The higher the number, the larger the spot. Form this map, we can see that larger cities are having a larger number of cases.